The Boeing 777-8 development has been put on hold.
The Airbus 350-1000 already has nine weight variants with different MTOW.
The A350-1000 put forward by Airbus has a 8,700nm range with a typical 375-passenger load.

The A350 has huge runs on the board with ULR variants already in service. Beyond Singapore, Qatar and other airlines are also already in talks with Airbus about new ULR models.